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Finding the Fourth Proportional to 3,572.72, 5,360 and 1,380.88

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Solution

The fourth proportional to 3,572.72, 5,360 and 1,380.88 is: 2,071.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,572.72 : 5,360 = 1,380.88 : x
  2. Step 2: Convert to fraction form
    3,572.72/5,360 = 1,380.88/x
  3. Step 3: Cross multiply
    3,572.72x = 5,360 × 1,380.88
  4. Step 4: Simplify right side
    3,572.72x = 7,401,516.80
  5. Step 5: Solve for x
    x = 7,401,516.80/3,572.72
  6. Step 6: Final answer
    x = 2,071.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.